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What is controlled variable in dry ice experiment

What is controlled variable in dry ice experiment
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What is controlled variable in dry ice experiment

User Slnowak
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dry ice creates smoke like people use it for scary haunted houses and stuff 
User Marcelo Alves
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The controlled variable is the variable the you control, so if you are investigating the affect of changing the amount (mass) of CO₂, then mass is your variable.
User Billy Jacobson
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